speed breaker unnecessary

What troubles you regarding traffic or pedestrian safety at that location?:

i was travelling from airport to chembur. on the way at kapadia nagar, signal, there is a speed breaker. the vehicles are slowing down for stopping at signal. then why, there is a speed breaker also? i cannot understand it. i waste more than 20-25 minutes as the entire traffic slows down and then climbs the bridge. this makes the traffic chaotic at bridge well.